Rietschle VVB 250.80 Instrucciones De Uso página 8

Trouble Shooting
1. Motor starter cuts out vacuum pump:
1.1 Check that incoming voltage and frequency corresponds with the motor data plate.
1.2 Check the connections on the motor terminal block.
1.3 Incorrect setting on the motor starter.
1.4 Motor starter trips too fast.
Solution: Use a motor starter with a time delay trip (version as per IEC 947-4).
1.5 The vacuum pump or the lubricating oil is too cold.
1.6 The viscosity of lubricant is too high.
1.7 Oil mist eliminator elements are blocked or contaminated.
1.8 Back pressure on the exhaust pipework is excessive.
2. Insufficient suction capacity:
2.1 Mesh filters are obscured.
2.2 Suction pipe work is too long or too small.
3. Vacuum pump does not reach ultimate vacuum:
3.1 Check for leaks on the suction side of the pump or at the system.
3.2 Viscosity of lubricant incorrect.
4. Vacuum pump operates at an abnormally high temperature:
4.1 Ambient or suction temperature too high.
4.2 Cooling air flow is restricted.
4.3 Problem as per 1.6, 1.7 and 1.8.
5. Exhausted air contains visible oil mist:
5.1 Oil separator elements are fitted incorrectly.
5.2 Incorrect oil brand is used.
5.3 Problem as per 1.7, 1.8, 4.1 and 4.2.
6. Unit emits abnormal noise:
Note: A knocking noise from the rotor blades is normal when cold starting as long as it disappears within two minutes with increasing operating
temperature.
6.1 The coupling rubbers are worn (see under "servicing").
6.2 The pump cylinder is worn. Solution: send your complete unit off for repair to the supplier or approved service agent.
6.3 Blades are damaged.
6.4 Problem as per 1.5 and 1.6.
7. Water in lubricant i.e. Emulsification:
7.1 Pump pulls in water because of the application.
Solution: Fit water separators on to the vacuum side.
7.2 Unit handles more water vapour than the gas ballast is designed for.
Solution: Consult supplier for the provision of an increased gas ballast capability.
7.3 Pump operates only for a short time and does not reach normal operating temperature.
Solution: Run the pump with closed suction until the oil has been cleaned.
Appendix:
Repair on Site: For all repairs on site an electrician must disconnect the motor so that an accidental start of the unit cannot happen.
All engineers are recommended to consult the original manufacturer or one of the subsidiaries, agents or service agents. The address of the closest
repair workshop can be obtained from the manufacturer on application.
After a repair or before re-installation, follow the instructions as shown under the headings Installation and Initial Operation.
Lifting and Transport: To lift and transport the vacuum pump the eye bolts on the pump and motor must be used. If an eye bolt is missing use
suitably rated strops. The weight of the pumps are shown in the accompanying table.
Storage: VVB units must be stored in dry ambient conditions with normal humidity. If a pump needs to be stocked for a period longer than 3 months
we would recommend to using an anticorrosion oil rather than the normal lubricant.
Disposal: The fast wearing parts (as listed in the spare parts lists) should be disposed of with due regard to health and safety regulations.
1.2001 / PM6